I think the problem lies with slicer saving a corrupt or incorrectly formatted .vtk file for the centerline. I followed the steps from this previous thread , but when I go to reopen the saved centerline I received the error I pasted above. I also receive an error when opening it in other .vtk file viewers such as paraview.
I’d be more than happy to provide the files for the model and the centerline if there is a way to do that.